The North Brunswick Police say that what appears to be a chlorine leak occurred at the North Brunswick Shopping Center.
Many residents remain unconvinced, complaining about the lingering smell of chemicals, headaches and pain.
"I make $14 an hour. Where am I supposed to go?" said Audrey DeSanzo, who lives about half a mile from the derailment with her two grade-school-age children. "I don't want to be here now with my kids."
New video shows the moments after the train caught fire.
State officials have repeatedly said water from the municipal system -- which is pulled from five deep wells covered by solid steel casing -- is safe to drink. However, the state's EPA encouraged residents who get water from private wells to get that water tested, the governor's office said.
Shawn Bilkey said the orange-colored gas that came from an overturned tractor-trailer carrying liquid nitric acid smelled like smoke, "but not fire smoke ... just not pleasant."